Again, the lining on a motor or carriage can, if care is taken, be done by the same means, although it must be said that the result is never quite equal to that produced by the hand of a skillful worker.
In relief work, such as ornamental iron, pressed paper, etc., some pretty effects may be produced by spraying a different colour to that of the ground in such a manner that only one side of the relief receives the second colour. This is effected by directing the spray from the side. Most readers will be familiar with these effects produced on menu cards, concert programmes, etc. The possibilities in connection with relief metal work are many.
Another series of effects in which brilliancy of colouring is required may be referred to in passing. Sometimes a bright red or a bright green is desired for the finish of a particular piece of work. In such cases a use of the process known as "colour glazing" is recommended. For example, an agricultural implement or any other article which it is desired should have a bright crimson finish can be first painted with Venetian or Indian red, by either spraying or dipping, and then have a coat of crimson lake, which will give an excellent effect. As the crimson lake is somewhat fugitive a protecting coat of varnish will be required.
All glazing colours may be applied by dipping, because, being semi-transparent, they are all very fine, and the coats may be thin, but the varnish should be applied by spraying or by hand. It may of course, be of a variety suitable for baking or stoving if required.
This process is an alternative to using coloured enamels, and in some cases gives better results. Much depends upon the colour and the constituents of the enamels. Many of the lakes are very sensitive to a high heat, which changes the colour to a dirty brown. In such cases a final coat of stoving varnish, if carefully handled, will be safer than some grades of enamel.
Scumbling and Colour Glazing.
For convenience of reference we include a short list of glazing colours taken from Andrew Miller's "Scumbling and Colour Glazing," published by the Trade Papers Publishing Co., Ltd., 365, Birkbeck Bank Chambers, London, W.C.
Glazing.
The principal colours used for glazing are cadmium, crimson lake, Prussian blue, lemon and orange, chrome, yellow, Brunswick green, carmine, madder lake, Chinese blue, cobalt, indigo, gamboge, terra verte and emerald green. These colours may be used ground in either linseed oil, turpentine or water. Some of them are rather expensive, but the coat being very thin a little colour goes a long way.
Following is a list of ground colours with the glazing which may be used in conjunction with them. They by no means exhaust the range of effects, but are given as suggestions:—